US4931178A - Filter cloth assembly - Google Patents

Filter cloth assembly Download PDF

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Publication number
US4931178A
US4931178A US06/723,848 US72384885A US4931178A US 4931178 A US4931178 A US 4931178A US 72384885 A US72384885 A US 72384885A US 4931178 A US4931178 A US 4931178A
Authority
US
United States
Prior art keywords
filter
cloth
assembly
filter cloth
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/723,848
Inventor
James L. Manniso
John H. Lutz
Craig R. Rinschler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WL Gore and Associates Inc
Original Assignee
WL Gore and Associates Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WL Gore and Associates Inc filed Critical WL Gore and Associates Inc
Assigned to W.L. GORE AND ASSOCIATES, INC., A CORP. OF DE. reassignment W.L. GORE AND ASSOCIATES, INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LUTZ, JOHN H., MANNISO, JAMES L., RINSCHLER, CRAIG R.
Priority to US06/723,848 priority Critical patent/US4931178A/en
Priority to JP61009063A priority patent/JPH0615006B2/en
Priority to EP89200562A priority patent/EP0323449A3/en
Priority to EP89200563A priority patent/EP0323450A3/en
Priority to GB8606034A priority patent/GB2173710B/en
Priority to EP86301798A priority patent/EP0201991A3/en
Priority to AU55678/86A priority patent/AU587441B2/en
Priority to ZA862846A priority patent/ZA862846B/en
Priority to GB888816534A priority patent/GB8816534D0/en
Priority to GB888816535A priority patent/GB8816535D0/en
Priority to GB8818635A priority patent/GB2207087B/en
Priority to GB8818634A priority patent/GB2207085B/en
Priority to AU36532/89A priority patent/AU3653289A/en
Publication of US4931178A publication Critical patent/US4931178A/en
Application granted granted Critical
Assigned to GORE ENTERPRISE HOLDINGS, INC. reassignment GORE ENTERPRISE HOLDINGS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: W.L. GORE & ASSOCIATES, INC., A CORP. OF DE
Anticipated expiration legal-status Critical
Assigned to W. L. GORE & ASSOCIATES, INC. reassignment W. L. GORE & ASSOCIATES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GORE ENTERPRISE HOLDINGS, INC.
Expired - Fee Related legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
    • C08J5/124—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives using adhesives based on a macromolecular component
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/001—Making filtering elements not provided for elsewhere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12—Filter presses, i.e. of the plate or plate and frame type
    • B01D25/176—Filter presses, i.e. of the plate or plate and frame type attaching the filter element to the filter press plates, e.g. around the central feed hole in the plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/22—Cell-type filters
    • B01D25/26—Cell-type stack filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0078—Measures or configurations for obtaining anchoring effects in the contact areas between layers
    • B29C37/0082—Mechanical anchoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/303—Particular design of joint configurations the joint involving an anchoring effect
    • B29C66/3034—Particular design of joint configurations the joint involving an anchoring effect making use of additional elements, e.g. meshes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/543—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining more than two hollow-preforms to form said hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/727—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being porous, e.g. foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7294—Non woven mats, e.g. felt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73753—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being partially cured, i.e. partially cross-linked, partially vulcanized
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73755—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being fully cured, i.e. fully cross-linked, fully vulcanized
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
    • B29K2105/243—Partially cured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0068—Permeability to liquids; Adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/14—Filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/32—Wheels, pinions, pulleys, castors or rollers, Rims

Definitions

  • This invention relates to a filter cloth assembly for use on a filter press plate, more particularly a center-feed filter press plate, which operates with a filter cloth on each side of the plate, a method for assembling a novel two-part filter cloth onto the plate, and a method for manufacturing the novel two-part filter cloth.
  • Filter presses are a well-known type of pressure filter made especially for liquid/solid separations. Such presses include a series of filter plates which are compressed together between two heads. Covering each plate is a filter cloth which covers all the area where filtration occurs. Each plate typically includes an opening located within the filtration surface area, usually near the center of the plate, and the plate has channels in its surface for passage of liquids. A solid/liquid mixture enters through the opening, passes into the spaces between the plates, then the liquid portion passes through the filter cloths into the channels and exits through an exit port for each plate. As the filtrate passes through the filter cloths, a cake of solids is built up in the spaces between the plates on the filter cloths.
  • the filter press When the filter press is filled with solid filter cake material, the filtration is stopped, and the cake is either washed from the press or, alternatively, the press is opened, the plates separated, and the solid filter cake is removed. The filter cloth can then also be removed for washing or replacement.
  • a conventional filter cloth passes through the center hole of the plate and covers both sides of the plate.
  • Most of such filter cloths available for use are comprised of a single unit having two sides with an interconnected tubular center hole section, the two sides of filter cloth usually being of unitary construction, and typically sewn together.
  • This construction while typical, is barely manageable if the filter cloth is stiff in nature or large in size, because one side of the cloth must be folded together and squeezed through the center hole of the filter plate, then unfolded on the other side to cover the other side of the filter plate. This process is often very difficult and time consuming, particularly if the filter cloth must be changed frequently.
  • a metal such as brass, or a plastic, screw-threaded, reusable mechanical coupling to hold two filter cloths together on opposite sides of a filter plate, has also been used.
  • Each half has a flange which holds the filter cloth against the plate. Thread clogging with slurry and thread wear upon coupling and uncoupling the filter assembly can be problems.
  • the amount of filter cloth caught behind and held by each flange is small, and hard turns of the coupling to hold it firmly in place under high pressure may damage the filter cloth.
  • the amount of pressure used is also a variable with each instance of installation of the cloth by each installer. Further, threaded fittings may open up the interior of the filter plate/filter cloth assembly to bypass of the seal through the bottoms of the thread root channels under liquid pressure.
  • a filter cloth embodying two filter cloths is disclosed in U.S. Pat. No. 4,053,416. Two single pieces of filter cloth were used, each having flexible flanged-based tubular stemmed coupling members which fitted into each end of a coupling cylinder which passed through the hole in the plate. A tool was utilized to effect the coupling which involved eversion of the flexible stem of one of the filter cloths into place in the coupling cylinder by means of the tool. No attachment was provided for the two cloths to each other and each cloth was held in place by friction between the springy elastomeric stem and the coupling cylinder in which it resided when the filter cloth was assembled.
  • the lack of attachment of the two cloths to each other and the varying amount of hold available from friction may be sources of leakage or provide attachment problems under rigorous conditions.
  • Known methods for attaching the stem or coupling member to the filter cloth, such as stitching may provide a source of leakage through the stitch holes.
  • Manipulation of the tool to evert the coupling of one cloth, assembling the cloth on a filter plate, then withdrawing the tool may not be as rapid or efficient a method of assembly as desired.
  • Another object of the invention is to provide a filter cloth assembly which is fast and easy to assemble on the filter plate or disassemble from it and provides a good liquid-tight seal with the plate.
  • a further object of the present invention is to provide novel methods for attaching and sealing coupling members, especially those having flanged bases, to filter cloths, then assembling the cloths into place on the filter plate.
  • the invention embodies a filter cloth assembly for use on a center hole filter press plate, a method for making flanged-based coupling members which are sealed to the filter cloth, and a method for adhering certain incompatible elastomeric polymers together which are useful in manufacturing the filter cloths of the invention.
  • the filter cloth assembly comprises two sections of a filter cloth disposed on opposite sides of a center-hole type of filter press plate, the first cloth having secured to it in alignment with a hole corresponding to that in the filter press plate a flanged-based tubular stem.
  • the second filter cloth comprises a similar cloth bearing a short flanged-based tubular coupling.
  • the stem of the first filter cloth is passed through the hole in the press plate, the coupling of the second filter cloth fitted over the protruding end of the stem of the first filter cloth such that the coupling surrounds the stem in a close-fitting concentric configuration, and a plastic or metal tension strap or band clamp placed around the outside of the coupling in a groove provided therein, and the strap or band clamp closed to a tension sufficient to effect a liquid-tight seal between the stem and the coupling.
  • FIG. 1 is a schematic cross-sectional diagram of a filter press assembly.
  • FIG. 2 is an exploded section view taken through the center hole of a filter press plate, including the plate, the first and second filter cloths disposed on either side of the plate, and the tension strap or band clamp to hold the two cloths in place tightly to the plate.
  • FIG. 3 is a broken sectional view of the filter cloth assembly in place on the filter plate.
  • FIG. 4 is a cross section of the second flanged-based tubular coupling, including circumferential beads molded into the inside surface of the coupling to aid in achieving a tight liquid seal with the stem from the other cloth.
  • FIG. 5 is a cross-section of a thermosetting elastomer into which a thermoplastic cloth has been pressed prior to fully curing the elastomer.
  • FIG. 6 is a cross-section of the elastomer and cloth shown in FIG. 5 adhesively bonded to a filter cloth.
  • FIG. 7 is a cross-section of an elastomeric filter coupling of the invention firmly bonded with an adhesive to an otherwise adhesively incompatible filter cloth.
  • FIG. 1 shows a schematic cross-sectional diagram of filter press 10 containing conventional filter plates 12.
  • the flow direction of slurry to be filtered and the outflow of filtrate are indicated by the arrows.
  • the flange-based stems 28 in the center holes of each filter plate 12 are discussed in detail below.
  • FIG. 2 there is shown a detailed schematic view of a filter cloth assembly for use on a center-hole type filter plate for use in a pressure filter press of the standard type, wherein a series of filter plates having filter cloths in place on each side are pressed together face to face such that a seal is formed at the edges of the plates between the stack of plates.
  • the liquid/solid mixture to be filtered is pumped through the center hole of the press, the solids are retained on the filter cloths of the plates as the liquid flows through the filter cloths, and the filtrate flows from the press from outlet ports in the channels provided therefor within the area covered by the filter cloths.
  • Filter cloth 14 is preferably a polypropylene or polyester textile felt or woven fabric to which is bonded to a polypropylene stem 28 having flange 30 as shown.
  • the flange 30 and the attached stem 28 are molded from a thermoplastic such as polypropylene, or other suitable thermoplastic materials, or from polytetrafluoroethylene (PTFE) material.
  • Flange 30 is fuse-bonded or bonded by means of a polypropylene hot melt or, in the case of a PTFE stem 28, a fluorinated ethylene-propylene (FEP) or poly fluoro alkylene (PFA) polymer hot melt, to the cloth 14, thereby providing a liquid-tight seal which prevents the liquid-solid mixture from bypassing the filter cloth 14.
  • FEP fluorinated ethylene-propylene
  • PFA poly fluoro alkylene
  • the bond between flange 30 and filter cloth 14 is indicated 32.
  • Other plastics may be used for the stem 28 and cloth 14 which will have equivalent properties.
  • Stem 28 is bonded to cloth 14 on the reverse side from the extended portion of the stem 28 which will extend through the hole of filter plate 12 to mate with and be attached to the second filter cloth 14 on the other side of plate 12.
  • stem 28 with molded flange 30 is formed from PTFE, and the cloth is a PTFE felt or fabric filter cloth
  • stem 28 is preferably preformed or premolded and then heat-bonded, melt-fused, or fuse-bonded with heat and pressure to cloth 14 by a layer 32 of FEP or PFA heat-fusible fluorocarbon polymer.
  • filter cloth preferably is a composition of a textile cloth 16 and a membrane 18 of expanded porous PTFE.
  • Coupling 26 having flange 20 is preferably silicone rubber or Viton® fluoro elastomer, and is molded in place on the filter cloth from liquid rubber or Viton fluoro elastomer and cured by a catalyst over a specified time and/or is heat cured.
  • stem 28 is formed from PTFE
  • coupling 26 is formed by molding it in place on the filter cloth from Viton fluoro elastomer or fluoro silicone rubber.
  • the plate 12 is laid over one cloth 14 as shown such that stem 28 protrudes through the hole therein.
  • the second cloth 14 is placed cloth-down on plate 12 over stem 28 which closely fits through coupling 26 to close tolerance.
  • the porous PTFE membrane 18 is always upstream of the textile layer 16.
  • Tension strap or band clamp 24 is then placed in the groove 21 about coupling 26 and tightened to the degree necessary to insure a liquid tight seal under the operating pressure being used with the filter press.
  • the band 24 may be a standard metal band clamp or a plastic strap and lock.
  • FIG. 3 shows the assembled filter cloths 14 on the filter plate 12.
  • Flange 30 of stem 28 provides a positive clamping effect on filter cloth 14 as does the flange 20 of coupling 26 when coupling 26 is pressed onto the filter plate 12 and strap 24 is appropriately tightened and locked.
  • Bond 32 is formed between filter cloth 14 and flange 20.
  • a preferred method of manufacture of flanged coupling 26 is to preform or premold flanged coupling 26 from silicone rubber or Viton fluoro elastomer or other suitable thermosetting elastomeric materials which have equivalent properties.
  • FIGS. 5 and 6 A method for bonding otherwise adhesively incompatible materials, for example, a fully cured silicone rubber coupling to a polypropylene textile felt filter cloth is depicted in FIGS. 5 and 6.
  • a premolded elastomeric coupling 36 of silicone rubber into which a thermoplastic cloth, woven or felt or other similar material, has been pressed prior to full curing of the elastomer 36. The pressing is done so that the elastomer penetrates into the cloth but does not penetrate all the way through the cloth 38.
  • the cloth 38 Upon full cure of the elastomer, the cloth 38 is mechanically tightly bound to the elastomer 36 and presents an adhesively compatible under surface of the composite coupling/cloth which can be adhesively bonded to the various filter cloths 16 by adhesive 32 as shown in FIG. 6.
  • the cloth 38 can be polyester or polypropylene or other similar plastic material.
  • a silicone adhesive 32 such as silicone "L” is coated on the surface of flange 20 to be bonded and around the hole area on filter cloth 14, as depicted in FIG. 7, and heat and pressure are applied so that the silicone adhesive penetrates both the polypropylene felt 38 bonded to coupling 26 and the surface of cloth layer 16.
  • the expanded PTFE layer 18 has been removed from the bond region so as to provide the adhesively compatible surface of cloth layer 16 for bonding.
  • bond 32 may be formed without using an adhesive when the cloth 38 and the cloth layer 16 are both thermoplastics such as polypropylene or polyester.
  • the bond is formed by applying heat and pressure to melt and fuse the cloths together.
  • the flanged coupling 26 of silicone rubber or fluoro elastomer could be molded in place onto the filter mat felt around the hole and cured to solid form, with, again, penetration of the liquid rubber only partially into the interstices of the textile filter felt.
  • silicone rubbers or fluoro elastomers can be made to form strongly bonded structures with a textile felt where the interstices of the felt are partially filled by the polymer, and the fibers of the felt link the two otherwise adhesively incompatible polymers together.
  • Textile felts or woven fabrics of polymers other than polypropylene and polyester may be used where they provide equivalent properties.
  • FIG. 4 is a cross-section of the flanged coupling 26 which has been molded with two beads 22 around the interior circumference, spaced so as to aid in forming a liquid-tight seal around stem 28 where stem 28 may be uneven or out-of-round and also spaced such that pressure from strap or ring clamp 24 will center between the two beads when clamp 24 is tightened.
  • the most preferred filter cloth material 14 for use in the filter cloth assembly of the invention is a layered composite sheet of filter cloth containing an upstream layer 18 of porous expanded PTFE bonded to a woven or felt textile filter 18 cloth of polypropylene, polyester, or the equivalent of these in properties.
  • the porous, expanded PTFE is prepared in accordance with one or more of U.S. Pat. Nos. 4,187,390; 4,110,392; 4,096,227; 3,962,153; 3,953,566; and 4,025,679.
  • the PTFE surface minimizes adherence of filtered solids to the filter cloth and aids in rapid and easy cleaning of the cloth.
  • a filter cloth having a layer of porous expanded PTFE is used in the assembly of the invention, as mentioned above the PTFE in the area of the cloth around the hole to be bonded to the flanges of stem 28 and coupling 26 must be removed so that the underlying polypropylene or polyester layer can be bonded to the flange. This can be done by a mechanical abrasion method, such as by using a wire brush or grit disc.
  • the flanged stem 28 is made from PTFE
  • the PTFE layer of the composite filter cloth is usually not removed and the flange and cloth in this instance are joined by bonding the two parts together with a layer of FEP or PFA hot melted or fuse-bonded by heat and pressure between them.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Textile Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Filtration Of Liquid (AREA)
  • Filtering Materials (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

This invention provides a filter cloth assembly for use on a filter plate of a center-feed filter press, which comprises a two-part filter cloth with fittings for rapid and easy assembly on the filter plate, one cloth on each side. Methods of manufacture of the novel assembly and its parts and a new method for bonding otherwise incompatible plastics and elastomers are disclosed.

Description

BACKGROUND OF THE INVENTION
This invention relates to a filter cloth assembly for use on a filter press plate, more particularly a center-feed filter press plate, which operates with a filter cloth on each side of the plate, a method for assembling a novel two-part filter cloth onto the plate, and a method for manufacturing the novel two-part filter cloth.
Filter presses are a well-known type of pressure filter made especially for liquid/solid separations. Such presses include a series of filter plates which are compressed together between two heads. Covering each plate is a filter cloth which covers all the area where filtration occurs. Each plate typically includes an opening located within the filtration surface area, usually near the center of the plate, and the plate has channels in its surface for passage of liquids. A solid/liquid mixture enters through the opening, passes into the spaces between the plates, then the liquid portion passes through the filter cloths into the channels and exits through an exit port for each plate. As the filtrate passes through the filter cloths, a cake of solids is built up in the spaces between the plates on the filter cloths. When the filter press is filled with solid filter cake material, the filtration is stopped, and the cake is either washed from the press or, alternatively, the press is opened, the plates separated, and the solid filter cake is removed. The filter cloth can then also be removed for washing or replacement.
In the center-hole type press, a conventional filter cloth passes through the center hole of the plate and covers both sides of the plate. Most of such filter cloths available for use are comprised of a single unit having two sides with an interconnected tubular center hole section, the two sides of filter cloth usually being of unitary construction, and typically sewn together. This construction, while typical, is barely manageable if the filter cloth is stiff in nature or large in size, because one side of the cloth must be folded together and squeezed through the center hole of the filter plate, then unfolded on the other side to cover the other side of the filter plate. This process is often very difficult and time consuming, particularly if the filter cloth must be changed frequently.
A metal, such as brass, or a plastic, screw-threaded, reusable mechanical coupling to hold two filter cloths together on opposite sides of a filter plate, has also been used. Each half has a flange which holds the filter cloth against the plate. Thread clogging with slurry and thread wear upon coupling and uncoupling the filter assembly can be problems. The amount of filter cloth caught behind and held by each flange is small, and hard turns of the coupling to hold it firmly in place under high pressure may damage the filter cloth. The amount of pressure used is also a variable with each instance of installation of the cloth by each installer. Further, threaded fittings may open up the interior of the filter plate/filter cloth assembly to bypass of the seal through the bottoms of the thread root channels under liquid pressure.
A filter cloth embodying two filter cloths is disclosed in U.S. Pat. No. 4,053,416. Two single pieces of filter cloth were used, each having flexible flanged-based tubular stemmed coupling members which fitted into each end of a coupling cylinder which passed through the hole in the plate. A tool was utilized to effect the coupling which involved eversion of the flexible stem of one of the filter cloths into place in the coupling cylinder by means of the tool. No attachment was provided for the two cloths to each other and each cloth was held in place by friction between the springy elastomeric stem and the coupling cylinder in which it resided when the filter cloth was assembled. The lack of attachment of the two cloths to each other and the varying amount of hold available from friction may be sources of leakage or provide attachment problems under rigorous conditions. Known methods for attaching the stem or coupling member to the filter cloth, such as stitching, may provide a source of leakage through the stitch holes. Manipulation of the tool to evert the coupling of one cloth, assembling the cloth on a filter plate, then withdrawing the tool may not be as rapid or efficient a method of assembly as desired.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to provide a filter cloth assembly for use on a center feed filter plate of a filter press which avoids the problems of prior art filter cloths.
Another object of the invention is to provide a filter cloth assembly which is fast and easy to assemble on the filter plate or disassemble from it and provides a good liquid-tight seal with the plate.
A further object of the present invention is to provide novel methods for attaching and sealing coupling members, especially those having flanged bases, to filter cloths, then assembling the cloths into place on the filter plate.
Briefly, the invention embodies a filter cloth assembly for use on a center hole filter press plate, a method for making flanged-based coupling members which are sealed to the filter cloth, and a method for adhering certain incompatible elastomeric polymers together which are useful in manufacturing the filter cloths of the invention.
The filter cloth assembly comprises two sections of a filter cloth disposed on opposite sides of a center-hole type of filter press plate, the first cloth having secured to it in alignment with a hole corresponding to that in the filter press plate a flanged-based tubular stem. The second filter cloth comprises a similar cloth bearing a short flanged-based tubular coupling. The stem of the first filter cloth is passed through the hole in the press plate, the coupling of the second filter cloth fitted over the protruding end of the stem of the first filter cloth such that the coupling surrounds the stem in a close-fitting concentric configuration, and a plastic or metal tension strap or band clamp placed around the outside of the coupling in a groove provided therein, and the strap or band clamp closed to a tension sufficient to effect a liquid-tight seal between the stem and the coupling.
Methods are given for either forming in place or adhering to the two filter cloths the flanged-based tubular stem and coupling by known methods or by a novel process to be subsequently described in detail.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic cross-sectional diagram of a filter press assembly.
FIG. 2 is an exploded section view taken through the center hole of a filter press plate, including the plate, the first and second filter cloths disposed on either side of the plate, and the tension strap or band clamp to hold the two cloths in place tightly to the plate.
FIG. 3 is a broken sectional view of the filter cloth assembly in place on the filter plate.
FIG. 4 is a cross section of the second flanged-based tubular coupling, including circumferential beads molded into the inside surface of the coupling to aid in achieving a tight liquid seal with the stem from the other cloth.
FIG. 5 is a cross-section of a thermosetting elastomer into which a thermoplastic cloth has been pressed prior to fully curing the elastomer.
FIG. 6 is a cross-section of the elastomer and cloth shown in FIG. 5 adhesively bonded to a filter cloth.
FIG. 7 is a cross-section of an elastomeric filter coupling of the invention firmly bonded with an adhesive to an otherwise adhesively incompatible filter cloth.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A detailed description of the invention is best provided with reference to the accompanying drawings wherein FIG. 1 shows a schematic cross-sectional diagram of filter press 10 containing conventional filter plates 12. The flow direction of slurry to be filtered and the outflow of filtrate are indicated by the arrows. The filter plates 12, when the assembly is completed, retain the filter cloths 14 in place, and the slurry flows to the cloths which collect the solids and allow the filtrate to pass through and exit the filter through outlet ports 15. The flange-based stems 28 in the center holes of each filter plate 12 are discussed in detail below.
Referring to FIG. 2, there is shown a detailed schematic view of a filter cloth assembly for use on a center-hole type filter plate for use in a pressure filter press of the standard type, wherein a series of filter plates having filter cloths in place on each side are pressed together face to face such that a seal is formed at the edges of the plates between the stack of plates. The liquid/solid mixture to be filtered is pumped through the center hole of the press, the solids are retained on the filter cloths of the plates as the liquid flows through the filter cloths, and the filtrate flows from the press from outlet ports in the channels provided therefor within the area covered by the filter cloths.
Filter cloth 14 is preferably a polypropylene or polyester textile felt or woven fabric to which is bonded to a polypropylene stem 28 having flange 30 as shown. The flange 30 and the attached stem 28 are molded from a thermoplastic such as polypropylene, or other suitable thermoplastic materials, or from polytetrafluoroethylene (PTFE) material. Flange 30 is fuse-bonded or bonded by means of a polypropylene hot melt or, in the case of a PTFE stem 28, a fluorinated ethylene-propylene (FEP) or poly fluoro alkylene (PFA) polymer hot melt, to the cloth 14, thereby providing a liquid-tight seal which prevents the liquid-solid mixture from bypassing the filter cloth 14.
Referring to FIG. 3, the bond between flange 30 and filter cloth 14 is indicated 32. Other plastics may be used for the stem 28 and cloth 14 which will have equivalent properties. Stem 28 is bonded to cloth 14 on the reverse side from the extended portion of the stem 28 which will extend through the hole of filter plate 12 to mate with and be attached to the second filter cloth 14 on the other side of plate 12. Where stem 28 with molded flange 30 is formed from PTFE, and the cloth is a PTFE felt or fabric filter cloth, stem 28 is preferably preformed or premolded and then heat-bonded, melt-fused, or fuse-bonded with heat and pressure to cloth 14 by a layer 32 of FEP or PFA heat-fusible fluorocarbon polymer.
Referring to both FIGS. 2 and 3, filter cloth preferably is a composition of a textile cloth 16 and a membrane 18 of expanded porous PTFE. Coupling 26 having flange 20 is preferably silicone rubber or Viton® fluoro elastomer, and is molded in place on the filter cloth from liquid rubber or Viton fluoro elastomer and cured by a catalyst over a specified time and/or is heat cured. Where stem 28 is formed from PTFE, coupling 26 is formed by molding it in place on the filter cloth from Viton fluoro elastomer or fluoro silicone rubber.
To assemble the filter cloths on the filter plate, the plate 12 is laid over one cloth 14 as shown such that stem 28 protrudes through the hole therein. The second cloth 14 is placed cloth-down on plate 12 over stem 28 which closely fits through coupling 26 to close tolerance. In this configuration, the porous PTFE membrane 18 is always upstream of the textile layer 16. Tension strap or band clamp 24 is then placed in the groove 21 about coupling 26 and tightened to the degree necessary to insure a liquid tight seal under the operating pressure being used with the filter press. The band 24 may be a standard metal band clamp or a plastic strap and lock.
FIG. 3 shows the assembled filter cloths 14 on the filter plate 12. Flange 30 of stem 28 provides a positive clamping effect on filter cloth 14 as does the flange 20 of coupling 26 when coupling 26 is pressed onto the filter plate 12 and strap 24 is appropriately tightened and locked. Bond 32 is formed between filter cloth 14 and flange 20.
A preferred method of manufacture of flanged coupling 26 is to preform or premold flanged coupling 26 from silicone rubber or Viton fluoro elastomer or other suitable thermosetting elastomeric materials which have equivalent properties.
A method for bonding otherwise adhesively incompatible materials, for example, a fully cured silicone rubber coupling to a polypropylene textile felt filter cloth is depicted in FIGS. 5 and 6. Therein is shown, in FIG. 5, a premolded elastomeric coupling 36 of silicone rubber, into which a thermoplastic cloth, woven or felt or other similar material, has been pressed prior to full curing of the elastomer 36. The pressing is done so that the elastomer penetrates into the cloth but does not penetrate all the way through the cloth 38. Upon full cure of the elastomer, the cloth 38 is mechanically tightly bound to the elastomer 36 and presents an adhesively compatible under surface of the composite coupling/cloth which can be adhesively bonded to the various filter cloths 16 by adhesive 32 as shown in FIG. 6. The cloth 38 can be polyester or polypropylene or other similar plastic material.
When using this method and the coupling 26 of the invention, after the coupling of silicone rubber is fully cured, a silicone adhesive 32 such as silicone "L" is coated on the surface of flange 20 to be bonded and around the hole area on filter cloth 14, as depicted in FIG. 7, and heat and pressure are applied so that the silicone adhesive penetrates both the polypropylene felt 38 bonded to coupling 26 and the surface of cloth layer 16. As shown in FIG. 7, the expanded PTFE layer 18 has been removed from the bond region so as to provide the adhesively compatible surface of cloth layer 16 for bonding. When cure is complete, a strong, tenacious and leak-proof bond 32 is formed.
Alternatively, bond 32 may be formed without using an adhesive when the cloth 38 and the cloth layer 16 are both thermoplastics such as polypropylene or polyester. The bond is formed by applying heat and pressure to melt and fuse the cloths together.
Additionally, the flanged coupling 26 of silicone rubber or fluoro elastomer could be molded in place onto the filter mat felt around the hole and cured to solid form, with, again, penetration of the liquid rubber only partially into the interstices of the textile filter felt. By this method, silicone rubbers or fluoro elastomers can be made to form strongly bonded structures with a textile felt where the interstices of the felt are partially filled by the polymer, and the fibers of the felt link the two otherwise adhesively incompatible polymers together. Textile felts or woven fabrics of polymers other than polypropylene and polyester may be used where they provide equivalent properties.
FIG. 4 is a cross-section of the flanged coupling 26 which has been molded with two beads 22 around the interior circumference, spaced so as to aid in forming a liquid-tight seal around stem 28 where stem 28 may be uneven or out-of-round and also spaced such that pressure from strap or ring clamp 24 will center between the two beads when clamp 24 is tightened.
The most preferred filter cloth material 14 for use in the filter cloth assembly of the invention is a layered composite sheet of filter cloth containing an upstream layer 18 of porous expanded PTFE bonded to a woven or felt textile filter 18 cloth of polypropylene, polyester, or the equivalent of these in properties. The porous, expanded PTFE is prepared in accordance with one or more of U.S. Pat. Nos. 4,187,390; 4,110,392; 4,096,227; 3,962,153; 3,953,566; and 4,025,679. The PTFE surface minimizes adherence of filtered solids to the filter cloth and aids in rapid and easy cleaning of the cloth.
When a filter cloth having a layer of porous expanded PTFE is used in the assembly of the invention, as mentioned above the PTFE in the area of the cloth around the hole to be bonded to the flanges of stem 28 and coupling 26 must be removed so that the underlying polypropylene or polyester layer can be bonded to the flange. This can be done by a mechanical abrasion method, such as by using a wire brush or grit disc. Where the flanged stem 28 is made from PTFE, the PTFE layer of the composite filter cloth is usually not removed and the flange and cloth in this instance are joined by bonding the two parts together with a layer of FEP or PFA hot melted or fuse-bonded by heat and pressure between them.
While the invention has been disclosed herein in connection with certain embodiments and detailed descriptions, it will be clear to one skilled in the art that modifications or variations of such details can be made without deviating from the gist of this invention, and such modifications or variations are considered to be within the scope of the claims hereinbelow.

Claims (16)

We claim:
1. A filter cloth assembly for use on a center-feed filter plate of a filter press comprising a first and a second section of filter cloth disposed on opposite sides of said plate, said cloths including concentric holes adapted to align with a corresponding hole in said plate; said first cloth including a tubular stem member having a flanged base, said base being secured to said cloth and extending from said cloth in concentric alignment with said hole in said cloth and adapted for extending through said hole in said plate and mating with a corresponding member on a second filter cloth disposed on the opposite side of said plate; said second cloth including a flanged coupling member having a flanged base secured to said second cloth in concentric alignment with said hole in said second cloth, the coupling member of said second cloth adapted to fit closely and concentrically over the tubular stem of the first cloth extending from the hole in the plate when the cloths are assembled in place on opposite sides of the filter plate; and means for effecting a non-leaking liquid seal between the stem and the coupling member of said first and second cloths as assembled together on the filter plate.
2. An assembly of claim 1 wherein the filter cloths comprise a layered composite of at least one layer of textile fabric and a membrane layer of porous expanded polytetrafluoroethylene.
3. An assembly of claim 2 wherein the textile fabric layer is polypropylene.
4. An assembly of claim 2 wherein the textile fabric layer is polyester.
5. An assembly of claim 2, wherein the textile fabric layer is polytetrafluoroethylene.
6. An assembly of claim 3 wherein the flanged stem of the first filter cloth comprises molded polypropylene.
7. An assembly of claim 4 wherein the flanged stem of the first filter cloth comprises molded polypropylene.
8. An assembly of claim 5 wherein the flanged stem of the first filter cloth comprises polytetrafluoroethylene.
9. An assembly of claim 3 wherein the flanged coupling member of the second filter cloth comprises silicone rubber.
10. An assembly of claim 4 wherein the flanged coupling member of the second filter cloth comprises silicone rubber.
11. An assembly of claim 3 wherein the flanged coupling member of the second filter cloth comprises a fluoroelastomer.
12. An assembly of claim 4 wherein the flanged coupling member of the second filter cloth comprises a fluoroelastomer.
13. An assembly of claim 5 wherein the flanged coupling member of the second filter cloth comprises a fluoroelastomer.
14. An assembly of claim 1 wherein the means for effecting the non-leaking liquid seal comprises securing a band or strap under effective tension around the coupling member of the second filter cloth.
15. An assembly of claim 14 wherein the band or strap is metal.
16. An assembly of claim 14 wherein the band or strap is plastic.
US06/723,848 1985-04-16 1985-04-16 Filter cloth assembly Expired - Fee Related US4931178A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US06/723,848 US4931178A (en) 1985-04-16 1985-04-16 Filter cloth assembly
JP61009063A JPH0615006B2 (en) 1985-04-16 1986-01-21 Filter cloth assembly for filter press and manufacturing method thereof
EP89200562A EP0323449A3 (en) 1985-04-16 1986-03-12 A method of bonding, in particular for a filter cloth assembly
EP89200563A EP0323450A3 (en) 1985-04-16 1986-03-12 A method of bonding, in particular for a filter cloth assembly
GB8606034A GB2173710B (en) 1985-04-16 1986-03-12 Filter cloth assembly for use on a centre-feed filter plate
EP86301798A EP0201991A3 (en) 1985-04-16 1986-03-12 Filter cloth assembly for use on a centre-feed filter plate
AU55678/86A AU587441B2 (en) 1985-04-16 1986-04-04 Filter cloth assembly
ZA862846A ZA862846B (en) 1985-04-16 1986-04-16 Filter cloth assembly
GB888816534A GB8816534D0 (en) 1985-04-16 1988-07-12 Method of bonding in particular for filter cloth assembly
GB888816535A GB8816535D0 (en) 1985-04-16 1988-07-12 Method of bonding in particular for filter cloth assembly
GB8818635A GB2207087B (en) 1985-04-16 1988-08-05 A method of bonding in particular for a filter cloth assembly
GB8818634A GB2207085B (en) 1985-04-16 1988-08-05 A method of bonding ,in particular for a filter cloth assembly
AU36532/89A AU3653289A (en) 1985-04-16 1989-06-16 Methods for bonding materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/723,848 US4931178A (en) 1985-04-16 1985-04-16 Filter cloth assembly

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US4931178A true US4931178A (en) 1990-06-05

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US06/723,848 Expired - Fee Related US4931178A (en) 1985-04-16 1985-04-16 Filter cloth assembly

Country Status (6)

Country Link
US (1) US4931178A (en)
EP (3) EP0323449A3 (en)
JP (1) JPH0615006B2 (en)
AU (2) AU587441B2 (en)
GB (5) GB2173710B (en)
ZA (1) ZA862846B (en)

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US5571413A (en) * 1992-06-22 1996-11-05 Junkosha Company Ltd. Composite filter material
US5599446A (en) * 1993-07-28 1997-02-04 Junker Filter Gmbh Filter medium with an embedded frame mounted to a support having a mating groove
US6007717A (en) * 1993-09-14 1999-12-28 Scapa Group Plc Filter cloths incorporating a feed passage connector for use with plate-type filter presses
US6132608A (en) * 1997-10-06 2000-10-17 Cuno Incorporated Optimized wax for sealing the edge of a filter sheet
AU739688B2 (en) * 1997-09-06 2001-10-18 Madison Filter 981 Limited Moulded filter media comprising a sheet of porous nonwoven material
US6365043B1 (en) * 1999-09-13 2002-04-02 Lenser Filtration Gmbh + Co. Filter plate for a filter press
US6843379B2 (en) 1999-09-14 2005-01-18 Outokumpu Oyj Corrosion-resistant filter element
US20070295658A1 (en) * 2006-06-26 2007-12-27 Richard Gaiser Adjustable barrel-neck connector
EP1923114A1 (en) 2006-11-16 2008-05-21 Sefar AG Filterelement, in particular plate for filter press
US20100200518A1 (en) * 2008-08-12 2010-08-12 Sefar Ag Filter element, securing ring and method for filtering
CN101966405A (en) * 2010-08-20 2011-02-09 杭州兴源过滤科技股份有限公司 Filter cloth bag for filtration of filter press
US20130193063A1 (en) * 2010-10-14 2013-08-01 Ying Yuk Ng Nonwoven fabric, method for producing the same, and filter formed with the same
US20140326651A1 (en) * 2011-02-28 2014-11-06 Fairtech Investment Limited Connector assembly for use in filter elements of press filter and press filter comprising the same
US20160153651A1 (en) * 2013-08-21 2016-06-02 Koninklijke Philips N.V. Textile optics - solution for robust flexible light treatment pads
US10131093B2 (en) 2013-04-03 2018-11-20 Arianegroup Sas Welded structural joint between a high-performance thermoplastic matrix composite material and an elastomer
CN109045783A (en) * 2018-09-21 2018-12-21 杭州兴源环保设备有限公司 A kind of novel filter press filter cloth set
US20220347603A1 (en) * 2021-04-30 2022-11-03 Pall Corporation Filter disk segments

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JPH0829206B2 (en) * 1987-09-10 1996-03-27 チッソ株式会社 Filter element manufacturing method
GB9206440D0 (en) * 1992-03-25 1992-05-06 Scapa Group Plc Method of forming a barrel neck connector
CA2240323C (en) * 1997-06-16 2004-05-11 Bridgestone Corporation Conveyor belt and method of making the same
ITMI20121001A1 (en) * 2012-06-08 2013-12-09 Flii Testori S P A REINFORCEMENT EYE FOR FILTERING LINERS, FILTERING CANVAS INCLUDING THE EYELET AND METHOD OF FIXING THE EYELET TO THE FILTERING MATERIAL

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US4053416A (en) * 1976-09-13 1977-10-11 Air Filters, Inc. Filter press assembly
US4235721A (en) * 1978-03-16 1980-11-25 Kurita Machinery Manufacturing Company Limited Reinforcing patch plate applied to liquid passage hole in filter-surfaced expressing sheet on expressing filter plate
US4237009A (en) * 1978-11-28 1980-12-02 Kurita Machinery Manufacturing Company Limited Filtration-compression type filter press
US4317734A (en) * 1978-11-28 1982-03-02 Tetsuya Kurita Filtration-compression type filter press
US4431502A (en) * 1980-11-05 1984-02-14 Olin Corporation Sealing means for filter press cells

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5571413A (en) * 1992-06-22 1996-11-05 Junkosha Company Ltd. Composite filter material
US5599446A (en) * 1993-07-28 1997-02-04 Junker Filter Gmbh Filter medium with an embedded frame mounted to a support having a mating groove
US6007717A (en) * 1993-09-14 1999-12-28 Scapa Group Plc Filter cloths incorporating a feed passage connector for use with plate-type filter presses
AU739688B2 (en) * 1997-09-06 2001-10-18 Madison Filter 981 Limited Moulded filter media comprising a sheet of porous nonwoven material
US6132608A (en) * 1997-10-06 2000-10-17 Cuno Incorporated Optimized wax for sealing the edge of a filter sheet
US6365043B1 (en) * 1999-09-13 2002-04-02 Lenser Filtration Gmbh + Co. Filter plate for a filter press
US6843379B2 (en) 1999-09-14 2005-01-18 Outokumpu Oyj Corrosion-resistant filter element
US20070295658A1 (en) * 2006-06-26 2007-12-27 Richard Gaiser Adjustable barrel-neck connector
EP1923114A1 (en) 2006-11-16 2008-05-21 Sefar AG Filterelement, in particular plate for filter press
US8197685B2 (en) * 2008-08-12 2012-06-12 Sefar Ag Filter element, securing ring and method for filtering
US20100200518A1 (en) * 2008-08-12 2010-08-12 Sefar Ag Filter element, securing ring and method for filtering
CN101966405A (en) * 2010-08-20 2011-02-09 杭州兴源过滤科技股份有限公司 Filter cloth bag for filtration of filter press
CN101966405B (en) * 2010-08-20 2013-09-04 杭州兴源过滤科技股份有限公司 Filter cloth bag for filtration of filter press
US20130193063A1 (en) * 2010-10-14 2013-08-01 Ying Yuk Ng Nonwoven fabric, method for producing the same, and filter formed with the same
US9731237B2 (en) * 2010-10-14 2017-08-15 Fairtech Investment Limited Nonwoven fabric, method for producing the same, and filter formed with the same
US20140326651A1 (en) * 2011-02-28 2014-11-06 Fairtech Investment Limited Connector assembly for use in filter elements of press filter and press filter comprising the same
US10246805B2 (en) * 2011-02-28 2019-04-02 Fairtech Investment Limited Connector assembly for use in filter elements of press filter and press filter comprising the same
US10131093B2 (en) 2013-04-03 2018-11-20 Arianegroup Sas Welded structural joint between a high-performance thermoplastic matrix composite material and an elastomer
US20160153651A1 (en) * 2013-08-21 2016-06-02 Koninklijke Philips N.V. Textile optics - solution for robust flexible light treatment pads
US9989243B2 (en) * 2013-08-21 2018-06-05 Philips Lighting Holding B.V. Textile optics—solution for robust flexible light treatment pads
CN109045783A (en) * 2018-09-21 2018-12-21 杭州兴源环保设备有限公司 A kind of novel filter press filter cloth set
US20220347603A1 (en) * 2021-04-30 2022-11-03 Pall Corporation Filter disk segments

Also Published As

Publication number Publication date
GB2173710B (en) 1989-06-21
GB8816534D0 (en) 1988-08-17
EP0323450A2 (en) 1989-07-05
GB8606034D0 (en) 1986-04-16
GB2207087A (en) 1989-01-25
GB2207085B (en) 1989-07-05
GB2173710A (en) 1986-10-22
GB8816535D0 (en) 1988-08-17
GB2207087B (en) 1989-07-05
EP0201991A2 (en) 1986-11-20
AU5567886A (en) 1986-10-23
AU587441B2 (en) 1989-08-17
GB2207085A (en) 1989-01-25
ZA862846B (en) 1986-12-30
EP0323449A3 (en) 1989-10-11
EP0323449A2 (en) 1989-07-05
EP0201991A3 (en) 1987-06-10
GB8818634D0 (en) 1988-09-07
JPH0615006B2 (en) 1994-03-02
EP0323450A3 (en) 1989-10-11
JPS61238310A (en) 1986-10-23
AU3653289A (en) 1989-10-05
GB8818635D0 (en) 1988-09-07

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